netdev - [PATCH net-next v4 1/5] netdevsim: maintain a list of probed netdevsims

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Date: Tue, 19 Dec 2023 17:47:43 -0800
From: David Wei <dw@...idwei.uk>
To: Jakub Kicinski <kuba@...nel.org>,
	Jiri Pirko <jiri@...nulli.us>,
	Sabrina Dubroca <sd@...asysnail.net>,
	netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next v4 1/5] netdevsim: maintain a list of probed netdevsims

This patch adds a linked list nsim_dev_list of probed netdevsims, added
during nsim_drv_probe() and removed during nsim_drv_remove(). A mutex
nsim_dev_list_lock protects the list.

Signed-off-by: David Wei <dw@...idwei.uk>
---
 drivers/net/netdevsim/dev.c       | 17 +++++++++++++++++
 drivers/net/netdevsim/netdevsim.h |  1 +
 2 files changed, 18 insertions(+)

diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index b4d3b9cde8bd..e30a12130e07 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -35,6 +35,9 @@
 
 #include "netdevsim.h"
 
+static LIST_HEAD(nsim_dev_list);
+static DEFINE_MUTEX(nsim_dev_list_lock);
+
 static unsigned int
 nsim_dev_port_index(enum nsim_dev_port_type type, unsigned int port_index)
 {
@@ -1531,6 +1534,7 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
 				 nsim_bus_dev->initial_net, &nsim_bus_dev->dev);
 	if (!devlink)
 		return -ENOMEM;
+	mutex_lock(&nsim_dev_list_lock);
 	devl_lock(devlink);
 	nsim_dev = devlink_priv(devlink);
 	nsim_dev->nsim_bus_dev = nsim_bus_dev;
@@ -1544,6 +1548,7 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
 	spin_lock_init(&nsim_dev->fa_cookie_lock);
 
 	dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);
+	list_add(&nsim_dev->list, &nsim_dev_list);
 
 	nsim_dev->vfconfigs = kcalloc(nsim_bus_dev->max_vfs,
 				      sizeof(struct nsim_vf_config),
@@ -1607,6 +1612,7 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
 
 	nsim_dev->esw_mode = DEVLINK_ESWITCH_MODE_LEGACY;
 	devl_unlock(devlink);
+	mutex_unlock(&nsim_dev_list_lock);
 	return 0;
 
 err_hwstats_exit:
@@ -1668,8 +1674,18 @@ void nsim_drv_remove(struct nsim_bus_dev *nsim_bus_dev)
 {
 	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 	struct devlink *devlink = priv_to_devlink(nsim_dev);
+	struct nsim_dev *pos, *tmp;
 
+	mutex_lock(&nsim_dev_list_lock);
 	devl_lock(devlink);
+
+	list_for_each_entry_safe(pos, tmp, &nsim_dev_list, list) {
+		if (pos == nsim_dev) {
+			list_del(&nsim_dev->list);
+			break;
+		}
+	}
+
 	nsim_dev_reload_destroy(nsim_dev);
 
 	nsim_bpf_dev_exit(nsim_dev);
@@ -1681,6 +1697,7 @@ void nsim_drv_remove(struct nsim_bus_dev *nsim_bus_dev)
 	kfree(nsim_dev->vfconfigs);
 	kfree(nsim_dev->fa_cookie);
 	devl_unlock(devlink);
+	mutex_unlock(&nsim_dev_list_lock);
 	devlink_free(devlink);
 	dev_set_drvdata(&nsim_bus_dev->dev, NULL);
 }
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index 028c825b86db..babb61d7790b 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -277,6 +277,7 @@ struct nsim_vf_config {
 
 struct nsim_dev {
 	struct nsim_bus_dev *nsim_bus_dev;
+	struct list_head list;
 	struct nsim_fib_data *fib_data;
 	struct nsim_trap_data *trap_data;
 	struct dentry *ddir;
-- 
2.39.3